Class UpToTwoPositiveIntOutputs

An FST Outputs implementation where each output
is one or two non-negative long values. If it's a
single output, Long is returned; else, TwoLongs. Order
is preserved in the TwoLongs case, ie .first is the first
input/output added to Builder, and .second is the
second. You cannot store 0 output with this (that's
reserved to mean "no output")!
NOTE: the resulting FST is not guaranteed to be minimal!
See Builder.

WARNING: This API is experimental and might change in incompatible ways in the next release.